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Statements of Common Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2019 $ 83,976 $ 50,209 $ 134,185
Balance (in shares) at Dec. 31, 2019 13,014,898    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 16,598 16,598
Cash dividends declared 0 (9,490) (9,490)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 1,805 0 1,805
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 41,088    
Stock-based compensation $ 154 0 154
Stock-based compensation (in shares) 4,831    
Balance at Dec. 31, 2020 $ 85,935 57,317 $ 143,252
Balance (in shares) at Dec. 31, 2020 13,060,817   13,060,817
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net income $ 0 16,984 $ 16,984
Cash dividends declared 0 (9,909) (9,909)
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans $ 2,082 0 2,082
Issuance of common stock under dividend reinvestment, direct stock and employee stock purchase plans (in shares) 45,961    
Stock-based compensation $ 213 0 213
Stock-based compensation (in shares) 6,170    
Balance at Dec. 31, 2021 $ 88,230 $ 64,392 $ 152,622
Balance (in shares) at Dec. 31, 2021 13,112,948   13,112,948